class Solution {
public:
    bool row[9][10];
    bool col[9][10];
    bool temp[3][3][10];
    bool isValidSudoku(vector<vector<char>>& board) {
        for (int i = 0; i < 9; i++) {
            for (int j = 0; j < 9; j++) {
                if (board[i][j] != '.') {
                    int num = board[i][j] - '0';
                    if (row[i][num] || col[j][num] || temp[i / 3][j / 3][num]) {
                        return false;
                    }
                    row[i][num] = col[j][num] = temp[i / 3][j / 3][num] = true;
                }
            }
        }
        return true;
    }
};